聚对苯二甲酸丙二醇酯/聚对苯二甲酸乙二酯互溶共混物中结晶导致的非晶区浓度变化

Change in Concentration of Amorphous Region Due to Crystallization in PTT/PET Miscible Blends.

作者信息

Sugeno Kousuke, Saito Hiromu

机构信息

Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo 184-8588, Japan.

出版信息

Polymers (Basel). 2024 Aug 17;16(16):2332. doi: 10.3390/polym16162332.

DOI:10.3390/polym16162332

PMID:39204552

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11358948/

Abstract

In a miscible crystalline/crystalline blend of poly(trimethylene terephthalate) (PTT) and poly(ethylene terephthalate) (PET), the PET spherulites grew at 240 °C when the PTT content was 30 wt% or less. The growth rate of PET spherulites decreased with time due to the exclusion of PTT from the growth front of PET spherulites into the amorphous region, resulting in a three-stage crystallization process. Due to the exclusion, the spherulite growth stopped before the volume filling of the PET spherulites, causing the formation of an excluded PTT amorphous region. When the temperature was lowered from 240 °C to 210 °C, the PTT spherulites grew in the excluded PTT amorphous region. The spherulite growth rate of PTT in the excluded PTT amorphous region was equivalent to that of a blend of 60-70 wt% PTT in 30/70 PTT/PET. These results suggest a significant change in the PTT concentration in the amorphous region, from the initial PTT content of 30 wt% to 60-70 wt%, due to the exclusion of PTT during the melt crystallization of PET at 240 °C.

摘要

在聚对苯二甲酸丙二醇酯（PTT）和聚对苯二甲酸乙二酯（PET）的可混溶结晶/结晶共混物中，当PTT含量为30 wt%或更低时，PET球晶在240°C下生长。由于PTT从PET球晶的生长前沿被排挤到非晶区，PET球晶的生长速率随时间降低，导致了一个三阶段结晶过程。由于这种排挤，球晶生长在PET球晶的体积填充之前就停止了，导致形成了一个被排挤的PTT非晶区。当温度从240°C降低到210°C时，PTT球晶在被排挤的PTT非晶区中生长。在被排挤的PTT非晶区中PTT的球晶生长速率与30/70 PTT/PET中60 - 70 wt% PTT的共混物的生长速率相当。这些结果表明，由于在240°C下PET熔体结晶过程中PTT被排挤，非晶区中PTT浓度发生了显著变化，从初始的30 wt%变为60 - 70 wt%。